Greater London · England
External & façade joints in Westbourne, Greater London
External mastic across Westbourne and nearby, with old sealant always removed completely and a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
About our external mastic in Westbourne
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. We work on façade panels, copings & trims and render & cladding joints, and common reasons people get in touch are failed seals between different materials and damp patches traced to an open external joint.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. For a flat in Westbourne, check the lease for who looks after the outside.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Westbourne (W2, W11, W9)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In Westbourne, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
- Keep pets and children clear of the area while we work
Get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Related advice
What happens if it’s left?
Resealing a run of joints in one go is generally better than patching one at a time. They’ve weathered the same way, and access only has to be arranged once. In a flat in Westbourne, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Why choose Mr Mastic in Westbourne
- An ARBOMaster approved applicator
- Rated 4.9 stars on Google
- White, clear, grey or another colour, product permitting
- Fully insured
What affects the cost of external mastic
We do not publish a price list, because no two jobs are the same. The quote depends on:
- Any working-time requirements on site
- Any mould that needs treating
- The type of sealant required
- How much old sealant there is and how hard it is to remove
What you pay reflects the work, not guesswork. That’s why we ask about the job first and send you a clear quote before any work starts.
What to tell us for a quote
When you call or email, it’s useful to know:
- What’s wrong with the joints now
- Any access issues, like height or stairs
- The type of property
- A few photos by email, if you can
If you are in Westbourne and need external mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Honest limits
In fairness, some problems need a different trade:
- Walls that need new movement joints cut into them
- Movement that’s more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Copings & trims
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Walls and rooflines in Westbourne
Historic houses like Kensington Palace (about 0.8 miles south-east) are a reminder that the area around Westbourne has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
In the older streets around St Stephen's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. For site and facilities teams at buildings such as St. Mary of the Angels Catholic Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Westbourne is about 1 mile north of Kensington, in Greater London. Across the W2 area, we cover external mastic for homes and businesses. Westbourne is one of 764 towns and villages in Greater London we cover.
Here we cover the W2, W11 and W9 postcode area for external mastic. Local streets include Salem Road, Acklam Road and Morgan Road. You will find Westbourne on the A404 and A4206, which makes it straightforward to reach with everything needed for external mastic. Other places close to Westbourne include Westbourne Green (1 mile north-east), Bayswater (1 mile south), Little Venice (1 mile north-east), Maida Vale (1 mile north) and Paddington Green (1 mile east). Within a short drive, we also cover London (5 miles east), St Pancras (3 miles east), Shoreditch (5 miles east), Walthamstow (9 miles north-east), Hoxton (5 miles east) and Whitechapel (5 miles east).
What’s near Westbourne
Locally, jobs take us to homes and businesses close to Maida Vale School, Abdus Salam Library and Westminster Academy. You will also find Emslie Horniman's Pleasance (0.8 miles north-west) and Cock and Bottle pub (under half a mile south-west). Westbourne’s nearest station is London Paddington station, about 0.8 miles east. Nearby you’ll also find Paddington General Hospital (0.5 miles north) and Greek Orthodox Cathedral Treasury Museum (less than half a mile south-east). The countryside around Westbourne includes Campden Hill and Greville Place nature reserve.
When to call us in Westbourne
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Keep an eye out for these signs:
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
- Failed sealant between panels on a façade
- Joints pointed up with cement by mistake
Westbourne is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What your quote should include
- What insurance they hold
- What happens if they find a problem under the old sealant
- What guarantee comes with the work
- What product goes in the joint
Nearby places to Westbourne
More services for Westbourne
How the job changes by surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. We prime where the sealant needs it before the bead.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Westbourne: your questions answered
Can you do external mastic in Westbourne?
Yes, Westbourne is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can parking be tricky for a visit in Westbourne?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
How long does external mastic take?
Typically it takes a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we will tell you how long to expect.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding.